博客园-deerchao的blog

对Ado.net Entity Data Model Designer很失望

deerchao — Mon, 18 Aug 2008 09:07:00 GMT

1,无法根据Entity Model自动生成Database schema

2,不会自动调整Entity, Property, Relationship名称的单复数形式(这可是连Linq 2 Sql Designer都能做到的事..)

3,关闭edmx文件后,再次双击无法打开.只能关闭solution,重新加载solution,然后再打开..

另外,感觉EDM本身目前真的不成熟,不过前途很光明,过个三五年应该就用着很爽了.

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collection.All(x=> whatever(x)) 与 collection.Any(x=>whatever(x))

deerchao — Mon, 11 Aug 2008 08:12:00 GMT

命题:如果一个集合里每个元素都满足某个条件,则此任集合内至少有一个元素满足此条件.

命题错误:

string[] list = new string[0];

Debug.Assert(list.All(x => x.Length == -1) );

Debug.Assert(list.Any(x => x.Length == -1);

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Asp.net MVC里的TempData是一个整体

deerchao — Mon, 04 Aug 2008 07:57:00 GMT

var a = TempData["a"];

var alsoA = TempData["a"] ;

//true

Debug.Assert(Object.ReferenceEqual(a, alsoA));

=================

objects within TempData will only be removed till the end of current request, if during which period you havn't set something new/old with the key. Sounds simple, but to me, it's not.

And here is a much simpler model, every piece of data got removed when ever you try go get it:

///

    /// TempData is a whole, all it's value exits in the whole request life time.
    /// So here is Flash, any item will be removed whenever you try to get it, much simpler model.
    ///

    public class Flash
    {
        private readonly HttpSessionState session;

        public static Flash Instance
        {
            get
            {
                return new Flash(HttpContext.Current);
            }
        }

        private Flash(HttpContext context)
        {
            session = context.Session;
        }

        public object this[string key]
        {
            get
            {
                var sessionKey = GetSessionKey(key);
                var obj = session[sessionKey];
                session.Remove(sessionKey);
                return obj;
            }
            set
            {
                var sessionKey = GetSessionKey(key);
                session[sessionKey] = value;
            }
        }

        private static string GetSessionKey(string key)
        {
            return "_Flash_Data_{0}".Form(key);
        }
    }

[新闻]福布斯:IE8很多功能针对谷歌微软要玩偷袭

it did suprise me a little bit..

deerchao — Thu, 24 Jul 2008 16:43:00 GMT

using System;

class P
{
    static void Main()
    {
        int i=1;
        Anchor[] list = new Anchor[3];
        for(; i<=3; i++)
        {
            list[i-1] = new Anchor();
            list[i-1].Clicked += delegate()
                {
                    Console.WriteLine("my id is anchor" +i);
                };
        }
        foreach(Anchor anchor in list)
        {
            anchor.FireClickEvent();
        }
    }

    class Anchor
    {
        public event Click Clicked;

        public void FireClickEvent()
        {
            if(Clicked!=null)
                Clicked();
        }
    }

    delegate void Click();
}

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无法删除附加到事件上的匿名代理

deerchao — Tue, 22 Jul 2008 07:05:00 GMT

//IT WON'T WORK!

var changed = false;
a.PropertyChanged += (sender, e) => changed = true;
....
a.PropertyChanged -= (sender, e) => changed = true;
if(changed)
....

//This one works:

var changed = false;

PropertyChangedEventHandler onchange = delegate { changed = true; };

a.PropertyChanged += onchange;

...

a.PropertyChanged -= onchange;

if(changed)

...

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